B:-AO and A3
C:-Al and A3
D:-A2 and A3
Correct Answer:- Option-B
Question56:-For a super-heterodyne receiver, which of the following is true ?
A:-Converts RF to IF then demodulates
B:-RF is converted to IF through demodulation
C:-RF and IF are combined to get demodulated signal
D:-RF is amplified to get IF
Correct Answer:- Option-A

Question57:-Consider 2x(t)cos (ct) is a DSB received signal, with x(t) as the
modulating signal having power Pa . What is the output power if the received signal
is coherent demodulated and lowpass filtered ?

A:-2P

B:-tPy-1

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൧:

Correct Answer:- Option-D

Question58:-A single Side Band (SSB) signal produced by a modulating signal A cos
(mt), With a carrier Cos (wc) is

4A €08(@mt) [cos(act) + jsin(wct)|

A sin(@mt) [cos(wet) + jsin(@ct)|
B:-

_ A[cos(@mt) cos(act)|

5A [cos(@mt) cos(act) — sin(@mt) sin(@ct)]

Correct Answer:- Option-D

Question59:-A signal, band limited to ०७ , is used to amplitude modulate a carrier.
What is the carrier frequency if the bandwidth of the AM modulated signal is 2% of
the carrier frequency ?

۵۲-2000
8:50०%
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[1

Correct Answer:- Option-C